DUBLIN, Ohio — Rickie Fowler showed poise beyond his 21 years, unfazed by six hours of rain delays yesterday at the Memorial or a series of charges up the leaderboard to keep his three-shot lead at Muirfield Village.

Another long day left him one round away from joining the recent youth movement on the PGA Tour.

Fowler showed some imagination with a cut 9-iron over the water to 6 feet for his first birdie of the round, and he kept bogeys off his card for the second straight day to shoot 3-under 69 to lead Tim Petrovic (68) and Ricky Barnes, who shot a tournament-best 62 while playing alongside Tiger Woods.

Fowler was at 16-under 200 and had the largest 54-hole lead at the Memorial since Woods led by six shots in 2000.

“I’m hitting the ball well,” Fowler said. “I kept it out of trouble, and I knew opportunities were coming around. It was a matter of waiting for them.”

Patience doesn’t seem to fit with the trend toward youth.

Fowler will try today to become the third PGA Tour winner in the last six weeks at age 22 or under, joining Rory McIlroy, who won Quail Hollow two days before his 21st birthday, and Jason Day, who was 22 when he won the Byron Nelson Championship.

For the first time since Woods returned to competition, he refused to speak to the media. “I’m done,” he said to a PGA Tour official before walking over a bridge toward the locker room, stopping to sign a few autographs at the top of a hill.

Woods had a 69, which included a double bogey on the 10th hole when his tee shot went 45 degrees to the right and out-of-bounds. He was at 6-under 210, tied for 20th, well out of contention.

Phil Mickelson, in his third tournament with a chance to become No. 1 in the world by winning, could only manage a 70 on a relatively easy day for scoring. He was at 8-under 208.

Mickelson also declined to speak to reporters.